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Brecon, Radnor and Cwm Tawe

Polluted by sewage 4,833 times in 2025 lasting 39,072 hours - That's 4.52 years!

Monitoring fell below 50% in some locations so could be more

© OpenStreetMap contributors
Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024

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Live data for Brecon, Radnor and Cwm Tawe in 2026

So far this year (as of 18 May 2026, 12:00) there has been 19,064 hours of sewage overflows, from 111 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s - that's 2.21 years!

Totals for Brecon, Radnor and Cwm Tawe in 2025

99 Sites polluted by Dwr Cymru Welsh Water
4,833 sewage dumps
39,072 hours duration
That's 4.52 years. On average 13.2 times a day

Change Over Time

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Constituencies near Brecon, Radnor and Cwm Tawe

Waterways in Brecon, Radnor and Cwm Tawe

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Brecon, Radnor and Cwm Tawe in 2025. Sometimes sewage can be being dumped for months at a time.

Reporting refers to how much of the time the monitoring was active. In this constituency 1 of the total 103 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway locations had reporting enabled for less than half the year.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Dwr Cymru Welsh Water Irfon River LLANWRTYD WELLS STW LLANWRTYD WELLS 148 2,649 99.9
Dwr Cymru Welsh Water River Tawe TREBANOS Wastewater Treament Works 140 2,476 97.3
Dwr Cymru Welsh Water Nant Logyn Trecastle Wastewater Treatment Works 149 2,077 99.9
Dwr Cymru Welsh Water River Garnant GCG - D/S of Graig Road CSO 158 1,990 98.1
Dwr Cymru Welsh Water Culverted, River Tawe CSO 4 Opposite Lamb & Flag Cottages 141 1,856 98.8
Dwr Cymru Welsh Water Unnamed R Neath PONTNEDDFECHAN STW SWANSEA 180 1,616 96.1
Dwr Cymru Welsh Water River Usk BRECON STW BRECON WWTW BRECON POWYS 85 1,429 99.9
Dwr Cymru Welsh Water River Usk SENNYBRIDGE ARMY CAMP STW 117 1,419 99.8
Dwr Cymru Welsh Water Right Bank Of River Twrch CSO on A4068 above Lower Brunorgan Bridge 112 1,410 95.8
Dwr Cymru Welsh Water River Ithon LLANDRINDOD WELLS STW PARK LANE 93 1,061 99.9
Dwr Cymru Welsh Water River Chwefru CILMERY STW 119 957 99.9
Dwr Cymru Welsh Water River Tawe CSO at Craig Y Duke Trebanos SOC 101 900 99.2
Dwr Cymru Welsh Water River Usk BWLCH (S) STW LLANGYNIDIR 107 872 99.7
Dwr Cymru Welsh Water Usk River SENNYBRIDGE STW 53 851 99.9
Dwr Cymru Welsh Water River Caerfanell TALYBONT SEWAGE TREATMENT WORKS TAL 76 798 99.9
Dwr Cymru Welsh Water River Cammarch BEULAH STW BEULAH POWYS WALES 59 754 99.9
Dwr Cymru Welsh Water River Ithon CROSSGATES STW 71 750 99.8
Dwr Cymru Welsh Water River Tawe YSTRADGYNLAIS WWTW OFF WIND ROAD 48 724 99.8
Dwr Cymru Welsh Water River Garnant CSO 27 BOUNDARY RD BRIDGE GARNANT 79 705 99.9
Dwr Cymru Welsh Water Upper Clydach CSO at Dilwyn Arms Pontardawe Cross NPT 101 696 99.9
Dwr Cymru Welsh Water River Ithon Llanddewi Toll House 65 547 96.2
Dwr Cymru Welsh Water River Irfon Abernant Lake CSO 70 524 98.2
Dwr Cymru Welsh Water Howey Brook Howey SPS 62 511 99.9
Dwr Cymru Welsh Water River Lugg LLANGUNLLO STW PS 40 509 99.9
Dwr Cymru Welsh Water U Nant Llech Colbren PS 1 Emerg 89 497 99.8
Dwr Cymru Welsh Water Nant Helen STATION RD GWYNFRYNLEN CSO 66 475 94.4
Dwr Cymru Welsh Water River Garnant CSO 26 QUARRY PLACE AMMONFORD 75 471 99.8
Dwr Cymru Welsh Water River Tawe CSO at Rear of Lonlas Station Road Abercrave 73 426 96.8
Dwr Cymru Welsh Water River Amman CSO 22 SW CORNER OF DISUSED TIP 52 386 99.9
Dwr Cymru Welsh Water River Tawe Pontardawe Leis Centre CSO Swansea 83 377 98.7
Dwr Cymru Welsh Water River Tawe SWN YR AFON CSO, Ystradgynlais 58 348 94.8
Dwr Cymru Welsh Water Wye River BUILTH WELLS STW 46 341 99.9
Dwr Cymru Welsh Water River Tawe Rear of Canal Cottage CSO, Abercrave 39 298 96.3
Dwr Cymru Welsh Water River Wye The Strand CSO, Church Street, Builth Wells 64 276 99.5
Dwr Cymru Welsh Water River Usk GARN PS CRICKHOWELL 53 274 99.8
Dwr Cymru Welsh Water River Irfon Cefn Gorwydd Wastewater Treatment Works 69 262 99.3
Dwr Cymru Welsh Water Upper Clydach River JAMES STREET CSO 73 260 95.3
Dwr Cymru Welsh Water River Irfon Dolwen Fields CSO 59 254 98.8
Dwr Cymru Welsh Water Nant Llynfell SWO.M'HOLE 154A GEORGE IV PH UPPER CSO 48 253 98.8
Dwr Cymru Welsh Water River Tawe CSO at O/S 17 Glantawe Row Ystradgynlais 74 251 99.1
Dwr Cymru Welsh Water Nant Hir CSO at GCG - rear of 40 Ger yr Afon 64 249 91.9
Dwr Cymru Welsh Water Llynfi River TALGARTH STW BRONLLYS ROAD TALGARTH 31 244 99.6
Dwr Cymru Welsh Water River Tawe SWO.M'HOLE12 CWMTAWE FM PENRHOS 36 244 97.7
Dwr Cymru Welsh Water River Twrch CSO 21 BRIDGE STREET 42 241 99.9
Dwr Cymru Welsh Water Wye River RHAYADER STW RHAYADER 20 239 99.9
Dwr Cymru Welsh Water River Wye Glasbury STW Glasbury Nr Hay On Wye 38 232 99.9
Dwr Cymru Welsh Water Henllan Brook CSO at Llanelwedd Primary School Bridge 36 231 99.3
Dwr Cymru Welsh Water River Wye Storm Tanks at Rhayader STW 40 216 99.9
Dwr Cymru Welsh Water River Tawe CSO at MH 92 nr Claypon Bridge, Ystradgynlais 35 214 99.4
Dwr Cymru Welsh Water River Ithon CSO OPPOSITE LODORE 65 212 99.9
Dwr Cymru Welsh Water River Tawe CSO at Ynysmeudw Warehouse (SOC 41 196 90.1
Dwr Cymru Welsh Water River Tawe CSO M'HOLE 14 ABERCRAVE ST.DAVIDS C 58 189 98.1
Dwr Cymru Welsh Water River Usk Llangynidr (Coed-yr-Ynys) SPS 43 179 98.3
Dwr Cymru Welsh Water River Tawe CSO 12 B4599 Road Bridge 59 166 99.8
Dwr Cymru Welsh Water Tregoyd Brook Three Cocks Aberllynfi SPS 35 159 99.5
Dwr Cymru Welsh Water River Usk SPS at Brecon - Watton 10 Metres South Of 66 136 99.9
Dwr Cymru Welsh Water Nant Gyrlais CSO 10 Rear Of Waun Gyrlais Penrhos 39 131 76.7
Dwr Cymru Welsh Water River Lugg PRESTEIGNE STW CLATTERBROOM 20 123 99.9
Dwr Cymru Welsh Water River Tawe CSO at Mason Arms, Ystradgynlais 24 116 99.4
Dwr Cymru Welsh Water River Tawe Office Row Car Park Ystalyfera CSO 45 116 99.9
Dwr Cymru Welsh Water River Usk Legar CSO 32 107 99.3
Dwr Cymru Welsh Water River Wye CHURCH LANE STW CHURCH ROAD 18 104 99.5
Dwr Cymru Welsh Water Unnamed Watercourse Bronllys Rear of garage A479 48 104 99.1
Dwr Cymru Welsh Water River Llynfi Trefecca Old Railway CSO, Maesgwyn 22 103 99.4
Dwr Cymru Welsh Water River Wye CSO at Rhayader WwTW 41 99 99.9
Dwr Cymru Welsh Water River Usk BRECON SEWERAGE SYSTEM 25 92 97.8
Dwr Cymru Welsh Water River Ithon PENYBONT P.S. 15 91 99.9
Dwr Cymru Welsh Water River Senni Brodawel - Sennybridge 16 91 98.6
Dwr Cymru Welsh Water Nant Gelli-Nedd CSO ADJ 97 CRAIG RD GELLINUDD 40 88 99.7
Dwr Cymru Welsh Water River Usk CRICKHOWELL STW ABERGAVENNY ROAD 13 87 99.9
Dwr Cymru Welsh Water River Cammarch Beulah SPS Beulah Powys 11 80 70.8
Dwr Cymru Welsh Water Irfon LLANGAMMARCH WELLS STW 9 68 99.4
Dwr Cymru Welsh Water River Usk Brecon Showfields CSO Brecon Powys 23 64 94.4
Dwr Cymru Welsh Water River Wye Hay-on-Wye (Main) SPS 40 54 90.2
Dwr Cymru Welsh Water River Tawe Pontardawe 2 To R Tawe CSO Swansea 14 53 99.8
Dwr Cymru Welsh Water River Usk CRICKHOWELL CSO 10 51 66.4
Dwr Cymru Welsh Water River Ithon CSO at RIDGEBOURNE CATCHMENT AREA LLANDRI 26 49 85.2
Dwr Cymru Welsh Water River Wye NEWBRIDGE-ON-WYE STW POWYS 26 43 99.9
Dwr Cymru Welsh Water River Tawe Nr Gough Arms MH CSO 14 41 96.7
Dwr Cymru Welsh Water Nant Y Llechau CSO Near Delffordd 17 30 97.8
Dwr Cymru Welsh Water River Lugg CSO at Presteigne - O/S SPS Tanyard 35 26 99
Dwr Cymru Welsh Water Nant Menascin 100 YARDS D/S OF LLANFRYNACH STW 10 24 99.9
Dwr Cymru Welsh Water River Usk CRICKHOWELL - BRIDGE END CAR P 3 24 99.9
Dwr Cymru Welsh Water River Ithon CSO at Ithon Road, Llandrindod Wells 16 19 99.9
Dwr Cymru Welsh Water River Tawe CSO Godre'r Graig SOC 20. Godre'r 13 19 99.9
Dwr Cymru Welsh Water Caerfanell Talybont Across from Cattle Market CSO 15 17 99
Dwr Cymru Welsh Water River Wye CSO Llanelwedd - Scout Hut Station Road 2 11 96.9
Dwr Cymru Welsh Water Felindre Brook Three Cocks 4 10 100
Dwr Cymru Welsh Water River Wye North Road CSO North Rd Builth Well 11 8 100
Dwr Cymru Welsh Water River Ennig CSO at Talgarth o/s Autumn lodge 6 6 100
Dwr Cymru Welsh Water River Llynfi A479 Bronlly Road CSO 6 4 99.5
Dwr Cymru Welsh Water River Usk Brynawel Estate, Trecastle CSO 2 1 97.3
Dwr Cymru Welsh Water River Usk Bridge St CSO 5 1 22.5
Dwr Cymru Welsh Water Nant Ddu Cray Sewage Treatment Works 1 1 99.9
Dwr Cymru Welsh Water River Wye CSO at Rhayader Fields St. Brides Church 4 1 99.1
Dwr Cymru Welsh Water River Usk Crickhowell - Bullpit Meadow S CSO 4 1 99.9
Dwr Cymru Welsh Water River Usk Via Surface Water Sewer Brecon Supermarket CSO 2 0 99.2
Dwr Cymru Welsh Water River Ithon Llanyre Wastewater Treatment Works 1 0 99.9
Dwr Cymru Welsh Water River Lugg Tanyard Pumping Station CSO/EO 1 0 100
Dwr Cymru Welsh Water River Wye CSO at Weun Chapel Park Toilets, Rhayader 0 0 100
Dwr Cymru Welsh Water Grywne Fawr CWRT Y GOLLEN SPS CRICKHOWELL 0 0 99.9
Dwr Cymru Welsh Water River Wye Hay-on-Wye (Warren Close) SPS 0 0 99.8
Dwr Cymru Welsh Water River Wye LLYSWEN STW CHURCH ROAD LLYSWEN 0 0 99.9

Data Sources & Accuracy

EDM (Event Duration Monitoring) data and Consented Discharges to Controlled Waters with Conditions from Environment Agency & Data Map Wales, and Scottish Water

Experimental derived data from Thames Water API, Some data may be missing or inaccurate. Live sewage data from Stream Water API

Uses Environment Agency rainfall data from the real-time data API (Beta) - Rainfall data is delayed by up to two days.

This website is intended to provide an accurate representation of the Environment Agency data. The data is hard to use, and thus some errors may have been made. If you find something that is incorrect, please raise an issue at the GitHub issues page and we'll endeavour to fix it quickly.

This project is not associated, approved or endorsed by any of the companies whose logos you see here.

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Analysing sewage pollution by the Water Industry

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